updated rails and sass-rails versions
runned rake rails:update and updated settings - overwritings some files and customizing others
using devise from github for solving a bug on rails 4.2.beta1
added thin. If the app isnt open on your browser when running with vagrant, just use: rails s -b 0.0.0.0 to avoid binding only to localhost
updating bootstrap-sass and bootstrap-wysihtml5 require statement
updating minor differences between rails 4.0 and rails 4.2 - added webconsole, html-sanitizer etc.